| //===-- NativeRegisterContextLinux.cpp ------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "NativeRegisterContextLinux.h" |
| |
| #include "lldb/Host/common/NativeProcessProtocol.h" |
| #include "lldb/Host/common/NativeThreadProtocol.h" |
| #include "lldb/Host/linux/Ptrace.h" |
| #include "lldb/Utility/RegisterValue.h" |
| |
| #include "Plugins/Process/Linux/NativeProcessLinux.h" |
| #include "Plugins/Process/POSIX/ProcessPOSIXLog.h" |
| |
| using namespace lldb_private; |
| using namespace lldb_private::process_linux; |
| |
| lldb::ByteOrder NativeRegisterContextLinux::GetByteOrder() const { |
| return m_thread.GetProcess().GetByteOrder(); |
| } |
| |
| Status NativeRegisterContextLinux::ReadRegisterRaw(uint32_t reg_index, |
| RegisterValue ®_value) { |
| const RegisterInfo *const reg_info = GetRegisterInfoAtIndex(reg_index); |
| if (!reg_info) |
| return Status("register %" PRIu32 " not found", reg_index); |
| |
| return DoReadRegisterValue(GetPtraceOffset(reg_index), reg_info->name, |
| reg_info->byte_size, reg_value); |
| } |
| |
| Status |
| NativeRegisterContextLinux::WriteRegisterRaw(uint32_t reg_index, |
| const RegisterValue ®_value) { |
| uint32_t reg_to_write = reg_index; |
| RegisterValue value_to_write = reg_value; |
| |
| // Check if this is a subregister of a full register. |
| const RegisterInfo *reg_info = GetRegisterInfoAtIndex(reg_index); |
| if (reg_info->invalidate_regs && |
| (reg_info->invalidate_regs[0] != LLDB_INVALID_REGNUM)) { |
| Status error; |
| |
| RegisterValue full_value; |
| uint32_t full_reg = reg_info->invalidate_regs[0]; |
| const RegisterInfo *full_reg_info = GetRegisterInfoAtIndex(full_reg); |
| |
| // Read the full register. |
| error = ReadRegister(full_reg_info, full_value); |
| if (error.Fail()) |
| return error; |
| |
| lldb::ByteOrder byte_order = GetByteOrder(); |
| uint8_t dst[RegisterValue::kMaxRegisterByteSize]; |
| |
| // Get the bytes for the full register. |
| const uint32_t dest_size = full_value.GetAsMemoryData( |
| full_reg_info, dst, sizeof(dst), byte_order, error); |
| if (error.Success() && dest_size) { |
| uint8_t src[RegisterValue::kMaxRegisterByteSize]; |
| |
| // Get the bytes for the source data. |
| const uint32_t src_size = reg_value.GetAsMemoryData( |
| reg_info, src, sizeof(src), byte_order, error); |
| if (error.Success() && src_size && (src_size < dest_size)) { |
| // Copy the src bytes to the destination. |
| memcpy(dst + (reg_info->byte_offset & 0x1), src, src_size); |
| // Set this full register as the value to write. |
| value_to_write.SetBytes(dst, full_value.GetByteSize(), byte_order); |
| value_to_write.SetType(full_reg_info); |
| reg_to_write = full_reg; |
| } |
| } |
| } |
| |
| const RegisterInfo *const register_to_write_info_p = |
| GetRegisterInfoAtIndex(reg_to_write); |
| assert(register_to_write_info_p && |
| "register to write does not have valid RegisterInfo"); |
| if (!register_to_write_info_p) |
| return Status("NativeRegisterContextLinux::%s failed to get RegisterInfo " |
| "for write register index %" PRIu32, |
| __FUNCTION__, reg_to_write); |
| |
| return DoWriteRegisterValue(GetPtraceOffset(reg_index), reg_info->name, |
| reg_value); |
| } |
| |
| Status NativeRegisterContextLinux::ReadGPR() { |
| return NativeProcessLinux::PtraceWrapper( |
| PTRACE_GETREGS, m_thread.GetID(), nullptr, GetGPRBuffer(), GetGPRSize()); |
| } |
| |
| Status NativeRegisterContextLinux::WriteGPR() { |
| return NativeProcessLinux::PtraceWrapper( |
| PTRACE_SETREGS, m_thread.GetID(), nullptr, GetGPRBuffer(), GetGPRSize()); |
| } |
| |
| Status NativeRegisterContextLinux::ReadFPR() { |
| return NativeProcessLinux::PtraceWrapper(PTRACE_GETFPREGS, m_thread.GetID(), |
| nullptr, GetFPRBuffer(), |
| GetFPRSize()); |
| } |
| |
| Status NativeRegisterContextLinux::WriteFPR() { |
| return NativeProcessLinux::PtraceWrapper(PTRACE_SETFPREGS, m_thread.GetID(), |
| nullptr, GetFPRBuffer(), |
| GetFPRSize()); |
| } |
| |
| Status NativeRegisterContextLinux::ReadRegisterSet(void *buf, size_t buf_size, |
| unsigned int regset) { |
| return NativeProcessLinux::PtraceWrapper(PTRACE_GETREGSET, m_thread.GetID(), |
| static_cast<void *>(®set), buf, |
| buf_size); |
| } |
| |
| Status NativeRegisterContextLinux::WriteRegisterSet(void *buf, size_t buf_size, |
| unsigned int regset) { |
| return NativeProcessLinux::PtraceWrapper(PTRACE_SETREGSET, m_thread.GetID(), |
| static_cast<void *>(®set), buf, |
| buf_size); |
| } |
| |
| Status NativeRegisterContextLinux::DoReadRegisterValue(uint32_t offset, |
| const char *reg_name, |
| uint32_t size, |
| RegisterValue &value) { |
| Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_REGISTERS)); |
| |
| long data; |
| Status error = NativeProcessLinux::PtraceWrapper( |
| PTRACE_PEEKUSER, m_thread.GetID(), reinterpret_cast<void *>(offset), |
| nullptr, 0, &data); |
| |
| if (error.Success()) |
| // First cast to an unsigned of the same size to avoid sign extension. |
| value.SetUInt(static_cast<unsigned long>(data), size); |
| |
| LLDB_LOG(log, "{0}: {1:x}", reg_name, data); |
| return error; |
| } |
| |
| Status NativeRegisterContextLinux::DoWriteRegisterValue( |
| uint32_t offset, const char *reg_name, const RegisterValue &value) { |
| Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_REGISTERS)); |
| |
| void *buf = reinterpret_cast<void *>(value.GetAsUInt64()); |
| LLDB_LOG(log, "{0}: {1}", reg_name, buf); |
| |
| return NativeProcessLinux::PtraceWrapper( |
| PTRACE_POKEUSER, m_thread.GetID(), reinterpret_cast<void *>(offset), buf); |
| } |